Yes

you do need a jacket based on the weather in Hamar, Norway 1 second ago

Why? Because it's pretty chilly!
56°F13°C & Cloudy

Wind is 3 mph5 km/h from the Southwest, gusting to 9 mph14 km/h
September 19
11pm56°F13°C3 mph5 km/h SouthwestCloudy
September 20
12am56°F13°C3 mph5 km/h SouthwestCloudy
1am55°F13°C3 mph5 km/h SouthwestMostly Cloudy
2am55°F13°C3 mph5 km/h SouthwestMostly Cloudy
3am56°F14°C3 mph5 km/h SouthwestMostly Cloudy
4am58°F14°C3 mph4 km/h SouthwestCloudy
5am59°F15°C3 mph5 km/h SouthwestCloudy
6am60°F16°C3 mph5 km/h SouthwestCloudy
7am61°F16°C4 mph7 km/h SouthwestCloudy
8am61°F16°C5 mph8 km/h SouthwestCloudy
9am61°F16°C5 mph7 km/h SouthwestCloudy
10am60°F15°C4 mph6 km/h SouthwestCloudy
DateLowHighWindDayNight
September 1954°F12°C61°F16°C3 mph5 km/h from SouthwestDrizzleDrizzle
September 2048°F9°C54°F12°C7 mph11 km/h from NorthwestRainDrizzle
September 2143°F6°C54°F12°C8 mph13 km/h from WestMostly CloudyMostly Clear
September 2239°F4°C54°F12°C5 mph7 km/h from NorthwestMostly ClearPartly Cloudy
September 2339°F4°C56°F13°C2 mph4 km/h from WestPartly CloudyMostly Clear
September 2439°F4°C55°F13°C2 mph4 km/h from WestPartly CloudyPartly Cloudy
September 2541°F5°C56°F13°C2 mph3 km/h from WestMostly ClearMostly Clear

Yes

Low of 47°F9°C, High of 55°F13°C
Wind: 7 mph11 km/h
Precipitation: 87% rain

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